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A unique pathway for sustained neurotrophin signaling through an ankyrin-rich membrane-spanning protein

Juan Carlos Arévalo1, Hiroko Yano, Kenneth K Teng

  • 1Molecular Neurobiology Program, Departments of Cell Biology, Physiology and Neuroscience, Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY 10016, USA.

The EMBO Journal
|May 29, 2004
PubMed

Insights

Ankyrin-rich transmembrane protein (ARMS) enables sustained signaling by neurotrophin receptors (Trk). ARMS acts as a neuronal platform for prolonged MAP kinase activation, crucial for cell biology.

Area of Science:

  • Cell Biology
  • Neuroscience
  • Molecular Signaling

Background:

  • Growth factor receptors activate signaling pathways, but molecular specificity remains unclear.
  • Neurotrophin receptors are known for prolonged signal transduction, yet the underlying mechanisms are not fully understood.

Purpose of the Study:

  • To elucidate the mechanisms behind sustained signaling complex assembly by neurotrophin receptors.
  • To identify key proteins involved in mediating prolonged signal transduction in response to neurotrophins.

Main Methods:

  • Investigated the association between ankyrin-rich transmembrane protein (ARMS) and Trk receptor tyrosine kinases.
  • Utilized dominant-negative ARMS mutants and small interference RNA (siRNA) to disrupt Trk-ARMS and ARMS-CrkL interactions.
  • Assessed the impact on downstream signaling pathways including ERK, Ras, and Akt.

Main Results:

  • ARMS specifically associates with Trk receptors, requiring transmembrane domain interactions.
  • Neurotrophin binding to Trk receptors induces ARMS tyrosine phosphorylation, creating a docking site for the CrkL-C3G complex.
  • Disruption of ARMS function significantly reduced neurotrophin-induced sustained ERK activation but did not affect Ras or Akt signaling.

Conclusions:

  • ARMS serves as a critical neuronal-specific platform for prolonged MAP kinase signaling mediated by neurotrophins.
  • This mechanism highlights a novel pathway for achieving sustained signaling specificity in response to neurotrophic factors.

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